Our department is at the forefront of using new seismological techniques to resolve the structure of the crust and mantle, and their dynamics. Through careful and novel manipulation of seismic data, we are providing new insights into the composition and heterogeneity of the Earth, and the underlying structure of the deep subsurface. We are applying these techniques to a number of diverse areas, including the Tien Shan Mountains (China), the San Andreas Fault, the Adirondacks, Yucca Mountain, Taiwan, and Central Asia.